CVE-2016-20012
MediumSummary
OpenSSH w wersjach do 8.7 pozwala zdalnym atakującym na sprawdzenie, czy określona kombinacja nazwy użytkownika i klucza publicznego jest znana serwerowi SSH. Dzieje się tak, ponieważ wyzwanie jest wysyłane tylko wtedy, gdy ta kombinacja może być ważna dla sesji logowania.
Risk Assessment
Atakujący mogą wykorzystać tę podatność do enumeracji użytkowników, co może prowadzić do dalszych ataków na system. Mimo to, dostawca nie uznaje tego za podatność w swoim produkcie.
Recommendation
Zaleca się aktualizację OpenSSH do najnowszej wersji, aby zminimalizować ryzyko związane z tą podatnością. Dodatkowo, warto rozważyć wdrożenie dodatkowych środków zabezpieczających, takich jak ograniczenie prób logowania.
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Original NVD description (English source)
OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product
Vulnerability data from NVD (NIST) · CISA KEV · EPSS